JPH05124788A - Walking crane - Google Patents

Abstract

PURPOSE:To widen a field of view for a crane operator, and improve the opera tional safety by constituting a crane operating cabin on a rotary stand of a crane mounted on a, traveling vehicle so as to be capable of ascending/ descending freely by means of operation of a hydraulic cylinder. CONSTITUTION:An extensible/contractible boom crane 3 arranged on a rotary stand 2 and an operating cabin 4 to operate this boom crane 3 or the rotary stand 2 and so on are provided on an automatic traveling vehicle l, and a hydraulic cylinder erected on the rotary stand 2 is arranged in the side part of the operating cabin 4, and the edge part of the hydraulic cylinder is installed on the side surface part of the operating chamber 4. As shown by an arrow Y, the operating chamber 4 in itself is constituted so as to be capable of freely ascending/descending vertically by means of operation of the hydraulic cylinder. As for members A hoisted by means of the boom crane 3, even if the height is increased as an assembly process progresses, since a field of view for an operator is widened according to ascension of the operating chamber 4, even if there exists an obstacle such as a wall, visibility becomes sufficient and a loading position can be confirmed, so that safety can be improved and workability becomes also excellent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile crane for an automatic traveling mobile crane, in which a cab of a boom crane is vertically movable.

[0002]

2. Description of the Related Art When using a mobile crane that is self-driving, for example, when unloading members at a construction site of a steel frame structure, the hierarchy of the structure increases as the assembly process progresses. In addition, depending on the situation of the construction site, there are power lines, under or near the bridge, and there are also fences, so it was necessary to work while avoiding these obstacles.

When a conventional mobile crane is used to perform work at a work site having an obstacle as described above, the operator's console is fixed to the turntable together with the crane, so that the operator's console can be operated. The field of view from is limited only to the turning range swung by the turntable. For this reason, it is often the case that the operator of the crane cannot see the position of the high place where the member lifted by the crane is to be placed and placed, or the position behind the obstacle. In such a case, the safety of the work has been ensured by interposing an intermediate person who sends a signal by a hand signal or a wireless signal at a place where a member is installed in addition to the crane operator or an intermediate position thereof.

[0004]

However, the signal by the intermediate man is an auxiliary function of the crane operation of the crane driver and not the visual operation of the driver himself. The current situation is that we have to rely on feelings. In addition, the cues from the intermediary and the feelings of the crane operator are mostly due to their many years of experience. Disappeared from the cockpit of a fixed crane,
There were problems such as the risk of an accident due to a load collapse.

[0005]

The present invention is configured as follows as a means for solving the above problems. A first invention, which is going to receive a patent, is configured so that a driver's cab of a mobile crane provided on a traveling vehicle body can be raised and lowered as needed. According to the present invention, in the unloading work from a high place by a crane, the operator's cab of the crane is moved up and down as the assembly level of the structure is increased. To that end, under power lines and bridge girders,
Since the operator's cab can be moved up and down according to the work situation on the backside of the fence or where there is an obstacle, work can be performed safely and speedily.

A second invention to be granted a patent is to install a boom crane, a driver's cab and a driver's cab elevating device on a turntable provided on a traveling vehicle body, and drive the driver's cab elevating device to rotate. Only the driver's cab on the platform can be raised and lowered. The present invention is a more specific configuration of the above-mentioned first invention, in which a boom crane, a driver's cab thereof, and an elevating device for raising and lowering the operator's cab are provided on a turntable, and only the operator's cab is moved up and down. It is freely configured.

[0007]

For example, in a crane unloading work at a construction site, when the construction level rises as the process progresses, the position where the member lifted by the crane is lowered may be difficult to see because it is behind a wall or structure. In the present invention, the hydraulic cylinder is driven by button operation or lever operation to raise the operator's cab fixed to the hydraulic cylinder.

Therefore, the driver's cab also rises, the field of view of the operator is widened, the driver can directly confirm the position where the member is lowered, and the work can proceed safely without the load collapse. Since this hydraulic cylinder can be installed as it is on the rotary table on which the conventional crane and cab are mounted, there is the convenience that the mobile crane installed in the conventional traveling vehicle can be used as it is.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described. FIG. 1 is a side view of a mobile crane according to an embodiment of the present invention in use, and FIG. Is.

In the figure, reference numeral 1 is an automatic traveling vehicle which is self-propelled by an internal combustion engine or the like. In this automatic traveling vehicle 1, a boom crane 3 which is extendable and retractable on a turntable 2 and the boom crane 3 are provided.
A driver's cab 4 for operating the rotary table 2 and the like is provided. A hydraulic jack 5 is provided between the boom crane 3 and the turntable 2, and a balance hanging weight 6 is provided at the rear of the turntable 2. Reference numeral 2a is a guide roller for smoothly rotating the turntable 2.

A pair of front outriggers 7, 7 are provided at the front part of the automatic vehicle 1, and a pair of rear outriggers 8, 8 are provided at the rear part. The front outriggers 7, 7 are of a horizontal and vertical type, and the rear outriggers 8, 8 are of an X type in rear view. An equilibrium hydraulic cylinder 9 is provided on the side of the cab 4 on the turntable 2, and an end portion 9 a of the hydraulic cylinder 9 is attached to a side surface of the cab 4. The operator's cab 4 itself is configured to be vertically movable as indicated by an arrow Y by the operation of the hydraulic cylinder 9.

As shown in FIG. 2, the elevating means for moving the operator cab 4 up and down has a guide frame 10 placed upright on the back of the operator cab 4, and the space between the guide frames 10 is fixed to the operator's cab 4 back. The plurality of rolling wheels 4a, 4a configured to roll up and down,
The operator's cab 4 may be moved up and down by the turning operation of the driving force M via the endless chain belt.

The member A hoisted by the boom crane 3 has an obstacle, such as a wall, because the operator's field of view becomes wider as the operator's cab 4 rises, even if the level rises due to the progress of the assembly process. In addition, it is possible to check the position where the cargo is unloaded, and it is possible to improve the safety performance without worrying about the collapse of the cargo. Also, be sure to sufficiently signal the intermediary and confirm the safety. The workability is good.

In the above embodiment, the means for raising and lowering the operator's cab 4 is necessarily raised and lowered by a hydraulic cylinder or an endless belt, but the invention is not limited to these, and for example, a rack and pinion driven by a motor may be bitten. They may be combined with each other, or may have a structure in which they are raised by a chain, a belt, a wire, or the like.

[0015]

INDUSTRIAL APPLICABILITY As described above, the present invention is designed to elevate the cab of a crane installed in an automatic vehicle as required. In the case of crane work to a high place, the work is made higher in height. As a result, the field of view of the crane operator is widened, and it is possible to safely unload and unload members and improve workability.

[Brief description of drawings]

FIG. 1 is a side view of a mobile crane in use.

FIG. 2 is a side view of another embodiment of the main part.

[Explanation of sign]

 1 Autonomous vehicle 2 Rotating platform 3 Boom crane 4 Operator's cab 9 Hydraulic cylinder 10 Guide frame

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Emi Shimohira, 5-26, Nankodai, Izumi-ku, Sendai-shi (72) Inventor, Hayashisaku Sato 3-28-22, Tsurugaoka, Izumi-ku, Sendai-shi

Claims (2)

[Claims] 1. A mobile crane, characterized in that a driver's cab of a mobile crane provided on a traveling vehicle body can be raised and lowered as required. 2. A boom crane, a driver's cab thereof, and a driver's cab elevating device are provided on a turntable provided on a traveling vehicle body, and the driver's cab elevating device is driven so that only the driver's cab on the turntable can be raised and lowered. A mobile crane characterized by the above.